Which of the following is characteristic of an oil-immersion objective? 

A. There is an air space between the specimen under examination and the objective.
B. It is used for specimens that need very high magnification.
C. It has a low-power lens with a magnification factor of 10x.
D. Condensed light passes through the specimen and the air space above the specimen.
E. Combined with the lens in the ocular, it has a total magnification factor of 500x.


B. It is used for specimens that need very high magnification.
Oil-immersion objectives are used for specimens that need very high magnification. Combined with the ocular lens, it has a total magnification factor of 1000x.

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